US10637346B2 - Filtering method for the alternating current side of a power conversion system, and power conversion system - Google Patents
Filtering method for the alternating current side of a power conversion system, and power conversion system Download PDFInfo
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- US10637346B2 US10637346B2 US16/094,768 US201616094768A US10637346B2 US 10637346 B2 US10637346 B2 US 10637346B2 US 201616094768 A US201616094768 A US 201616094768A US 10637346 B2 US10637346 B2 US 10637346B2
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- power conversion
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 152
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000001914 filtration Methods 0.000 title claims abstract description 17
- 238000013016 damping Methods 0.000 claims abstract description 133
- 230000001052 transient effect Effects 0.000 claims abstract description 51
- 239000003990 capacitor Substances 0.000 claims abstract description 22
- 230000001939 inductive effect Effects 0.000 claims description 17
- 238000013461 design Methods 0.000 description 9
- 239000000243 solution Substances 0.000 description 7
- 230000008901 benefit Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Definitions
- the present invention is related to filtering methods for the alternating current side of a power conversion system, and to power conversion systems with which the power delivered at the alternating current side is filtered.
- power converters included in power conversion systems used for transforming energy generated from a variable source for connection to the grid, produce output currents and voltages that include harmonic components at the switching frequency (SWF) of the power converters and multiples of those harmonic components.
- SWF switching frequency
- the installation of filters at the alternating current side such as LC or LCL filters at the output of the power converters 103 ′ is commonly known in power conversion systems 100 ′, as shown in FIG. 1 for example, and several solutions have been analyzed related to the design of said type of filters. Some solutions include using an output reactor for the output of each power converter, an RC branch, and a second reactor connected to the grid.
- a commonly used design criteria is to select a filter at the alternating current side of the converter comprising a configuration or topology with a resonant frequency (fres) is far enough from both the switching frequency (fsw) of the power converter and the fundamental frequency of the grid (fg), according to the following equation: 10 f g ⁇ f res ⁇ 0.5 f sw
- a damping resistive element is usually included for attenuating the resonance of the filter.
- a controllable filter topology at the alternating current side of a power converter is proposed.
- the filter includes a plurality of capacitors and a single damping resistive element, a rectifier connected between the capacitors and the single damping resistor, and a switching element for disconnecting the damping resistor during start-up of the power conversion system, said damping resistor being connected once the system is under steady state conditions (under normal operation).
- Certain non-limiting exemplary embodiments can provide a filtering method for the alternating current side of a power conversion system with a filter circuit arranged at said alternating current side, and a power conversion system including the filter circuit.
- a first aspect of certain non-limiting exemplary embodiments refers to a filtering method for the alternating current side of a power conversion system by a filter circuit arranged at said alternating current side, the filter circuit including a filter capacitor circuit and a damping circuit connected to the filter capacitor circuit.
- the damping circuit of the filter circuit is caused to present a first impedance value for the current that flows through said damping circuit.
- said damping circuit is caused to present a second impedance value for said current, said second impedance value being different from the first impedance value, preferably greater.
- the impedance value for transient state conditions (not steady state conditions) it is possible to reduce the duration of this transitory response, and this allows the power conversion system to recover control of the currents at the alternating current side with a lower time lapse. Additionally, the modification of the impedance value reduces the module of said currents, thus reducing the electromechanical stress of the components of the filter circuit and of the power conversion system, the lifetime of said components being increased.
- the resonance frequency can be moved during the transient state conditions.
- said peak could be moved to another frequency in which said peak is not excited by the control or could be more easily dampened during transient state conditions.
- a second aspect of certain non-limiting exemplary embodiments refers to a power conversion system for converting energy from an alternating current or direct current power source.
- the power conversion system includes a power converter which is connected to an electrical grid, and a filter circuit arranged at the alternating current side of the power conversion system.
- the filter circuit includes a filter capacitor circuit and a damping circuit connected to the filter capacitor circuit.
- the damping circuit is connected in series or in parallel to the filter capacitor circuit and is configured to present a first impedance value for a current that flows through the damping circuit when the power conversion system is operating under steady state conditions, and to present a second impedance value for said current when the power conversion system is not operating under steady state conditions, the second impedance value being different from the first impedance value, preferably greater.
- the power conversion system further includes a selecting device configured to cause the damping circuit to present the first impedance value or the second impedance value, according to the conditions under which the power conversion system is operating.
- FIG. 1 shows, schematically, a conventional power conversion system.
- FIG. 2 shows, schematically, an embodiment of the power conversion system.
- FIG. 3 shows, schematically, an embodiment of the power conversion system, where a switching actuator and a component associated to said switching actuator of the damping circuit are shown.
- FIG. 4 shows the resonance in steady state conditions, and also the resonances in transient state conditions for two different examples of impedance values for the current passing through the damping circuit of an embodiment of the power conversion system.
- FIG. 5 shows a configuration of the damping circuit of an embodiment of the power conversion system.
- FIG. 6 shows a configuration of the damping circuit of an embodiment of the power conversion system.
- FIG. 7 shows a configuration of the damping circuit of an embodiment of the power conversion system.
- FIG. 8 shows a configuration of the damping circuit of an embodiment of the power conversion system.
- FIG. 9 shows a configuration of the damping circuit of an embodiment of the power conversion system.
- a first aspect of an exemplary embodiment refers to a filtering method for the alternating current side 100 a of a power conversion system 100 , carried out by a filter circuit 104 arranged at the alternating current side 100 a of the power conversion system 100 .
- the alternating current side 100 a is three-phase.
- the power conversion system 100 includes a power converter 103 with an alternating current side 103 a forming part of the alternating current side 100 a of the power conversion system 100 and which is connected to an electrical grid G, directly or through at least one component such as a transformer.
- both the power converter 103 and the filter circuit 104 form part of the power conversion system 100 itself.
- FIGS. 2 and 3 both the power converter 103 and the filter circuit 104 form part of the power conversion system 100 itself.
- the filter circuit 104 includes, at least, a filter capacitor circuit 6 that includes at least one filter capacitor per each phase of the alternating current side 100 a , and a damping circuit 1 connected to the filter capacitor circuit 6 , the filter circuit 104 being connected to the alternating current side 103 a of the power converter 103 .
- the power conversion system 100 connected to a grid G for delivering power to said grid G operates normally, the power conversion system 100 is said to be operating under steady state conditions.
- the power conversion system 100 is not operating under steady state conditions, said power conversion system 100 is said to be operating under transient state conditions.
- Said transient state conditions can be given during voltage-dips or over-voltages at the alternating current side 100 a of the power conversion system 100 for example, or during other failure conditions at said alternating current side 100 a.
- the damping circuit 1 of the filter circuit 104 is caused to present a first impedance value for a current i that flows through the damping circuit 1 , and upon determining that the power conversion system 100 is operating under transient state conditions the damping circuit 1 of the filter circuit 104 is caused to present a second impedance value for said current i.
- the second impedance value is different from the first impedance value, preferably greater.
- the damping circuit 1 has a single branch, the current i that flows through it has a single component. However, if the damping circuit 1 has more branches (for example 2 or 3 parallel branches), the current i that flows through it is divided into different components. Throughout the description a current i refers to the current that flows through the damping circuit, and as such, current i must be interpreted as the only component (in the case of a single branch in the damping circuit 1 ) or the sum of all components (in the case of a plurality of branches in the damping circuit 1 ) of the current flowing through the damping circuit.
- the impedance value of the filter circuit 104 can be varied in a very simple manner upon detecting that the operating conditions of the power conversion system 100 vary (from the transient state conditions to the steady state conditions or vice versa), and the filter circuit 104 can be optimized for the determined operating conditions with minimum loses at steady state conditions, and for ensuring stability and controllability of said power conversion system 100 during transient state conditions.
- the filter circuit 104 filters at the currents at the alternating current side 100 a of the power conversion system 100 avoiding the control-loss over said currents, and when the power conversion system 100 is operating under steady state conditions the filter circuit 104 does not cause great losses and the efficiency of the power conversion system 100 is not reduced in a great extent at steady state conditions.
- At least one electrical property of at least one electrical signal associated to the alternating current side 100 a of the power conversion system 100 is measured or detected, and the conditions under which the power conversion system 100 is operating are determined according to said measure.
- the measure of an electrical property at the alternating current side 100 a of the power conversion system 100 can be done in a known manner, by way of known sensors, and, therefore, the method can be implemented in a very easy way in power conversion systems and without the need of adding additional complex components.
- such type of power conversion systems 100 generally includes a device for measuring or detecting an electrical property at the alternating current side 100 a , and consequently, in such power conversion system 100 no additional components are needed, or additional measurements could be taken as for example the voltage or current through the filter circuit 6 in the case of adding additional sensors.
- the electrical property can be measured or detected at the alternating current side 103 a of the power converter 103 , at the filter circuit 104 , or at any other point of the alternating current side 100 a of the power conversion system 100 .
- the measured electrical property can be selected, for example, from the module of a voltage signal at the alternating current side 100 a of the power conversion system 100 (at any phase), the module of a current signal at said alternating current side 100 a (at any phase), the frequency of a voltage signal at the alternating current side 100 a (at any phase), and the frequency of a current signal at the alternating current side 100 a (at any phase):
- the damping circuit 1 is configured to offer two alternative paths with different impedance values to the current i flowing through it, the damping circuit 1 including a switching actuator 13 which is controlled to select the path to be followed by the current i when flows through the damping circuit 1 .
- the switching actuator 13 is configured to adopt two different states, each one of said states being associated with a path to be followed by the current i when the current flows through the damping circuit 1 : when the switching actuator 13 is in a first state the current i is caused to flow through the first path in the damping circuit 1 , and when the switching actuator 13 is in a second state the current i is caused to flow through the second path in the damping circuit 1 . Controlling the switching actuator 13 it is possible to maintain or to modify its state.
- the first path for the current i in the damping circuit offers the first impedance value for said current i, while a second path for said current i offers the second impedance value for said current i. Said effect is explained with the example shown in FIG. 3 for example.
- the second path includes the switching actuator 13 , and at least one resistive and/or inductive component 10 associated to said switching actuator 13 . Depending on the state of said switching actuator 13 , the current i flows through the resistive and/or inductive component 10 or not. If the second impedance value is intended for the damping circuit 1 , then the switching actuator 13 is caused to allow the current i to flow through the resistive and/or inductive component 10 .
- the current i flowing through the filter capacitor 6 flows through the second path of the damping circuit 1 . If the first impedance value is intended for the damping circuit 1 , then the switching actuator 13 is caused to not allow the current i to pass through the resistive and/or inductive component 10 . In said situation, the current i flowing through the filter capacitor 6 flows through the first path of the damping circuit 1 instead of the second path.
- the method can be implemented in power conversion systems 100 having damping circuits 1 of different configurations, provided that said damping circuits 1 have at least two alternative paths for the current I flowing said damping circuit 1 : a first path for when the power conversion system 100 is operating under steady state conditions, and a second path for when said power conversion system 100 is operating under transient state conditions.
- the damping circuit 1 thus has at least one switching actuator 13 and at least one resistive and/or inductive component 10 associated to the switching actuator 13 by which the path for said current i is selected in a controlled manner.
- the resonance frequency at the alternating current side 100 a of the power conversion system 100 can be varied during transient state conditions, said resonance frequency depending on the configuration of the second path as is shown by way of example in FIG. 4 .
- the current flows through the resistive and/or inductive component 10 when flowing through the damping circuit 1 .
- FIG. 4 shows the resonance F 1 in steady state conditions, and also two different resonances F 2 a and F 2 b in transient state conditions for two different configurations of the second path.
- the resonance F 2 a the resistive and/or inductive component 10 is formed by a resistive element that dampens the resonance peak, but the resonance frequency is the same as during steady state conditions.
- the resistive and/or inductive component 10 is formed by a resistive element and an inductive element connected in series. The resistive element causes the peak to be dampened, and the incorporation of the inductive element causes a variation in the resonance frequency (from 750 Hz to 650 Hz approximately).
- the resonance frequency can be varied during transient state conditions if desired. Therefore, another frequency can be selected such that the resonance is not excited or is dampened by the control of the power converter 103 more easily.
- the switching actuator 13 has a switching element with two states, each one of said states being associated with a path to be followed by the current i when it flows through the damping circuit 1 and the state of the switching element being controlled (and that of the switching actuator 13 ) according to the measured electrical property at the alternating current side 100 a of the power conversion system 100 .
- the switching actuator 13 can be, for example, a controlled switching element as shown in FIGS. 6 to 9 , the first state being an open position of said switching element and the second state being a closed position of said switching element (or vice versa).
- a second aspect of certain exemplary embodiments refers to a power conversion system 100 for converting the energy from an alternating current or from a direct current power source 105 , as shown by way of example in FIGS. 2 and 3 .
- the power conversion system 100 is adapted in such a way that the method according to certain embodiments can be implemented therein.
- the power conversion system 100 includes a power converter 103 having an alternating current side 103 a which is connected to a grid G, directly or through at least one component such as a transformer, and a filter circuit 104 arranged at the alternating current side 100 a of the power conversion system 100 .
- the filter circuit 104 includes a filter capacitor circuit 6 that includes at least one filter capacitor per each phase of the alternating current side 103 a of the power converter 103 (or of the alternating current side 100 a of the power conversion system 100 ), and a damping circuit 1 connected to the filter capacitor circuit 6 .
- the alternating current side 100 a is three-phase.
- the damping circuit 1 is connected in series or in parallel to the filter capacitor circuit 6 , and it is configured to present a first impedance value for a current i that passes through the damping circuit 1 when the power conversion system 100 is operating under steady state conditions, and to present a second impedance value for said current i when the power conversion system 100 is operating under transient state conditions.
- the second impedance value is different from the first impedance value, preferably greater.
- the damping circuit 1 is configured to present the first impedance value or the second impedance value as required. Therefore, as explained when referring to the first aspect, the power conversion system 100 includes a filtering circuit 104 with which at least the already described advantages and effects both, when the power conversion system 100 is operating under steady state conditions or under transient state conditions, are obtained.
- the power conversion system 100 further includes a selecting device, or selector, to cause the damping circuit 1 to present the first or second impedance value for the current i that flows through it in a controlled manner.
- the selecting device includes a measuring device 4 for measuring or detecting at least one electrical property of at least one electrical signal associated with the alternating current side 100 a of the power conversion system 100 , a switching actuator 13 arranged in the damping circuit 1 , and a controller 5 in communication with said measuring device 4 and with the switching actuator 13 .
- the controller 5 is configured to determine, according to said measured electrical property, the conditions under which the power conversion system 100 is operating (steady state or transient state), and to control the switching actuator 13 in order to cause the damping circuit 1 to present the first impedance value or second impedance value for the current i that flows through said damping circuit 1 according to said determination.
- the controller 5 can be a microprocessor unit, a microcontroller unit, a FPGA (“Field Programmable Gate Array”) or other device with computing abilities, and can be the same controller in charge of controlling the power converter 103 (as represented in FIG. 3 ) or a different controller.
- the measuring device 4 is configured, in each case, for measuring a current or a voltage, and to calculate their modules, or for measuring the frequencies of at least one current signal or a voltage signal, and the controller 5 is configured to calculate the module of the current or voltage if it is the case, and to determine according to said module or to the frequency the conditions under which the power conversion system 100 is operating.
- the damping circuit 1 is configured for offering two alternative paths with different impedance values for the current i flowing through said damping circuit 1 , the current i being able to follow a first path with a first impedance value r a second path with a second impedance value when flowing through said damping circuit 1 .
- the path to be followed by the current i is selected by the selecting device at each moment depending on the determined operating conditions: if it is determined that the power conversion system is operating under steady state conditions, the first path is selected, and if it is determined that the power conversion system is operating under transient state conditions, the second path is selected.
- the first path presents a first impedance value for the current i
- the second path presents a second impedance value for said current i, different from the first impedance value, as commented before.
- the switching actuator 13 is configured to adopt two different states, each one of said states being associated with a path to be followed by the current i when it flows through the damping circuit 1 .
- the controller 5 is configured to control the state of said switching actuator 13 , according to the determination of said controller 5 about the conditions under which the power conversion system 100 is operating.
- the switching actuator 13 includes a plurality of switching elements, and it is configured to adopt two different states (one for each different operating conditions of the power conversion system 100 ). Each one of said switching elements can adopt two different states (opened or closed), and the controller 5 is configured to control the state of said switching elements according to the determined operating conditions for the power conversion system 100 , the switching actuator 13 being thus caused to adopt one state or the other according to said control.
- the switching actuator 13 can include an active power converter including the plurality of switching elements.
- the damping circuit 1 can further include a resonance damping component 11 with a certain impedance value, configured in such a manner that the current i flowing through the damping circuit 1 flows also through said resonance damping component 11 independently of the operating conditions of the power conversion system 100 (steady state conditions and transient state conditions).
- the current i flows through said resonance damping component 11 when the first path is selected and when the second path is selected.
- the resonance damping component 11 can thus be arranged in parallel to both paths, or in series before or after both paths.
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Abstract
Description
10f g <f res<0.5f sw
-
- if the selected electrical property is the module of a voltage signal at the alternating
current side 100 a of thepower conversion system 100, thepower conversion system 100 is determined to be operating under steady state conditions if the value of said electrical property is greater than a minimum predetermined value of the corresponding module and less than a maximum predetermined value of said module, and thepower conversion system 100 is determined to be operating under transient state conditions if the value of said electrical property is less than or equal to said minimum predetermined value of the corresponding module or greater than or equal to said maximum predetermined value of said module; - if the selected electrical property is the module of a current signal at the alternating
current side 100 a of thepower conversion system 100, thepower conversion system 100 is determined to be operating under steady state conditions if the value of said electrical property is greater than a minimum predetermined value of the corresponding module and less than a maximum predetermined value of said module, and thepower conversion system 100 is determined to be operating under transient state conditions if the value of said electrical property is less than or equal to said minimum predetermined value of the corresponding module or greater than or equal to said maximum predetermined value of said module; - if the selected electrical property is the frequency of a voltage signal at the alternating
current side 100 a of thepower conversion system 100, thepower conversion system 100 is determined to be operating under steady state conditions if the value of said electrical property is greater than a minimum predetermined value of the corresponding frequency and less than a maximum predetermined value of said frequency, and thepower conversion system 100 is determined to be operating under transient state conditions if the value of said electrical property is less than or equal to said minimum predetermined value of the corresponding frequency or greater than or equal to said maximum predetermined value of said frequency; and - if the selected electrical property is the frequency of a current signal at the alternating
current side 100 a of thepower conversion system 100, thepower conversion system 100 is determined to be operating under steady state conditions if the value of said electrical property is greater than a minimum predetermined value of the corresponding frequency and less than a maximum predetermined value of said frequency, and thepower conversion system 100 is determined to be operating under transient state conditions if the value of said electrical property is less than or equal to said minimum predetermined value of the corresponding frequency or greater than or equal to said maximum predetermined value of said frequency.
- if the selected electrical property is the module of a voltage signal at the alternating
Claims (18)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/ES2016/070278 WO2017182680A1 (en) | 2016-04-19 | 2016-04-19 | Filtering method for the ac side of a power conversion system and power conversion system |
Publications (2)
Publication Number | Publication Date |
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US20190131865A1 US20190131865A1 (en) | 2019-05-02 |
US10637346B2 true US10637346B2 (en) | 2020-04-28 |
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Family Applications (1)
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US16/094,768 Expired - Fee Related US10637346B2 (en) | 2016-04-19 | 2016-04-19 | Filtering method for the alternating current side of a power conversion system, and power conversion system |
Country Status (4)
Country | Link |
---|---|
US (1) | US10637346B2 (en) |
EP (1) | EP3447891A1 (en) |
JP (1) | JP6697578B2 (en) |
WO (1) | WO2017182680A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20230099313A1 (en) * | 2021-09-24 | 2023-03-30 | Zeng Hsing Industrial Co., Ltd. | Motor drive system and motor drive method |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102079877B1 (en) * | 2018-12-12 | 2020-02-19 | 한국전력공사 | Resonance monitoring device and method |
Citations (5)
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---|---|---|---|---|
US20090273185A1 (en) * | 2005-11-21 | 2009-11-05 | Josu Ruiz Flores | System for Controlling and Protecting Against Symmetrical and Asymmetrical Faults for Asynchronous-Type Generators |
US20120155125A1 (en) * | 2010-12-17 | 2012-06-21 | Yanfeng Zhang | Wind turbine generator |
US20130039105A1 (en) | 2011-08-09 | 2013-02-14 | Hamilton Sundstrand Corporation | Filter circuit for a multi-phase ac input |
WO2015092553A2 (en) | 2013-12-18 | 2015-06-25 | Ingeteam Power Technology, S.A. | Variable impedance device for a wind turbine |
US20160013715A1 (en) * | 2014-07-08 | 2016-01-14 | Rockwell Automation Technologies, Inc. | Lcl filter resonance mitigation technique for voltage source converters |
-
2016
- 2016-04-19 US US16/094,768 patent/US10637346B2/en not_active Expired - Fee Related
- 2016-04-19 EP EP16726348.2A patent/EP3447891A1/en not_active Withdrawn
- 2016-04-19 WO PCT/ES2016/070278 patent/WO2017182680A1/en active Application Filing
- 2016-04-19 JP JP2018554722A patent/JP6697578B2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US20090273185A1 (en) * | 2005-11-21 | 2009-11-05 | Josu Ruiz Flores | System for Controlling and Protecting Against Symmetrical and Asymmetrical Faults for Asynchronous-Type Generators |
US20120155125A1 (en) * | 2010-12-17 | 2012-06-21 | Yanfeng Zhang | Wind turbine generator |
US20130039105A1 (en) | 2011-08-09 | 2013-02-14 | Hamilton Sundstrand Corporation | Filter circuit for a multi-phase ac input |
WO2015092553A2 (en) | 2013-12-18 | 2015-06-25 | Ingeteam Power Technology, S.A. | Variable impedance device for a wind turbine |
US20160013715A1 (en) * | 2014-07-08 | 2016-01-14 | Rockwell Automation Technologies, Inc. | Lcl filter resonance mitigation technique for voltage source converters |
Non-Patent Citations (3)
Title |
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A. Reznik et al., "LCL Filter Design and Performance Analysis for Grid Interconnected Systems", IEEE Transactions on Industry Applications, Mar./Apr. 2014, 7 pages, vol. 50, No. 2. |
International Search Report of PCT/ES2016/070278 dated Jan. 25, 2017. |
Mikel Zabaleta et al. "LCL Grid Filter Design of a Multi-Megawatt Medium-Voltage Converter for Offshore Wind Turbine using SHEPWM Modulation" IEEE Trans. Ind. Electron., Mar. 2016, 8 pages, vol. 31, No. 3. |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20230099313A1 (en) * | 2021-09-24 | 2023-03-30 | Zeng Hsing Industrial Co., Ltd. | Motor drive system and motor drive method |
US11942834B2 (en) * | 2021-09-24 | 2024-03-26 | Zeng Hsing Industrial Co., Ltd. | Motor drive system and motor drive method |
Also Published As
Publication number | Publication date |
---|---|
US20190131865A1 (en) | 2019-05-02 |
JP6697578B2 (en) | 2020-05-20 |
EP3447891A1 (en) | 2019-02-27 |
JP2019514334A (en) | 2019-05-30 |
WO2017182680A1 (en) | 2017-10-26 |
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